import java.io.IOException;
import java.util.Vector;

/**
 * Created by moshee
 * on: 07/06/17
 * to compile in place: `javac ConsumeHeap.java`
 * Execute: `java -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/log/app-`date +%s`-pid$$.hprof -XX:OnOutOfMemoryError=/opt/app/bin/upload_dump_s3.sh -Xmx2m ConsumeHeap`
 * HeapDumpOnOutOfMemoryError specifies to automatically create a dump when OOM occures
 * HeapDumpPath supplies a path to put that file
 * OnOutOfMemoryError specifies a script(s) to run after dump is created (in this case upload_dump_s3.sh)
 */
public class ConsumeHeap {

    public static void main(String[] args) throws IOException {
        Vector v = new Vector();
        while (true)
        {
            byte b[] = new byte[1048576];
            v.add(b);
            Runtime rt = Runtime.getRuntime();
            System.out.println( "free memory: " + rt.freeMemory() );
        }

    }
}